Check 48V Ground Connection – 2021-2023 Mercedes-Benz E-Class, CLS, & AMG GT

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OMB Control No.: 2127-0004
Part 573 Safety Recall Report 24V-100
The information contained in this report was submitted pursuant to 49 CFR §573
Manufacturer Name : Submission Date :
Mercedes-Benz USA, LLC FEB 09, 2024 NHTSA Recall No. : 24V-100 Manufacturer Recall No. : 2024MMNNNN Manufacturer Information :
Manufacturer Name : Mercedes-Benz USA, LLC Address : 13470 International Parkway
Jacksonville FL 32218
Company phone : 1-877-496-3691
Population :
Number of potentially involved : 12,191 Estimated percentage with defect : 100 %
Vehicle Information :
Vehicle 1 : 2021-2023 Mercedes-Benz CLS 450 Vehicle Type : LIGHT VEHICLES Body Style : 4-DOOR Power Train : GAS
Descriptive Information : Mercedes-Benz 2021-2023 CLS 450 2,130 Vehicles. The recall population was determined through production records. Vehicles outside of the recall population have 48V ground connections are tightened to the specified torque.
Production Dates : OCT 21, 2021 – APR 04, 2023
VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2021-2023 Mercedes-Benz E 450 Vehicle Type : LIGHT VEHICLES Body Style : 4-DOOR Power Train : GAS
Descriptive Information : Mercedes-Benz 2021-2023 E 450, 2,706 vehicles. The recall population was determined through production records. Vehicles outside of the recall population have 48V ground connections are tightened to the specified torque.
Production Dates : OCT 21, 2021 – APR 04, 2023
VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 24V-100 Page 2 Vehicle 3 : 2021-2023 Mercedes-Benz E 450 All-Terrain Vehicle Type : LIGHT VEHICLES Body Style : STATIONWAGON Power Train : GAS
Descriptive Information : Mercedes-Benz 2021-2023 E 450 All-Terrain, 1,650 vehicles. The recall population was determined through production records. Vehicles outside of the recall population have 48V ground connections are tightened to the specified torque.
Production Dates : OCT 21, 2021 – APR 04, 2023
VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 4 : 2021-2021 Mercedes-Benz AMG CLS 53 Vehicle Type : LIGHT VEHICLES Body Style : 4-DOOR Power Train : GAS
Descriptive Information : Mercedes-Benz 2021 AMG CLS 53, 2 vehicles. The recall population was determined through production records. Vehicles outside of the recall population have 48V ground connections are tightened to the specified torque.
Production Dates : OCT 21, 2021 – APR 04, 2023
VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 5 : 2021-2023 Mercedes-Benz AMG E 53 Vehicle Type : LIGHT VEHICLES Body Style : 4-DOOR Power Train : GAS
Descriptive Information : Mercedes-Benz 2021-2023 AMG E 53, 1,665 vehicles. The recall population was determined through production records. Vehicles outside of the recall population have 48V ground connections are tightened to the specified torque.
Production Dates : OCT 21, 2021 – APR 04, 2023
VIN Range 1 : Begin : NR End : NR Not sequential The information contained in this report was submitted pursuant to 49 CFR §573 Part 573 Safety Recall Report 24V-100 Page 3 Vehicle 6 : 2021-2023 Mercedes-Benz AMG GT 43 Vehicle Type : LIGHT VEHICLES Body Style : 4-DOOR Power Train : GAS
Descriptive Information : Mercedes-Benz 2021-2023 AMG GT 43, 1,688 vehicles. The recall population was determined through production records. Vehicles outside of the recall population have 48V ground connections are tightened to the specified torque.
Production Dates : OCT 21, 2021 – APR 04, 2023
VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 7 : 2021-2023 Mercedes-Benz AMG GT 53 Vehicle Type : LIGHT VEHICLES Body Style : 4-DOOR Power Train : GAS
Descriptive Information : Mercedes-Benz 2021-2023 AMG GT 53, 2,350 vehicles. The recall population was determined through production records. Vehicles outside of the recall population have 48V ground connections are tightened to the specified torque.
Production Dates : OCT 21, 2021 – APR 04, 2023
VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect :
Description of the Defect : Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has determined that on certain Model Year (“MY”) 2021-2024 E-Class (213 platform), CLS (257 platform) and AMG GT 4-door (290 platform) vehicles, the 48V ground connection located in the engine compartment might not be tightened to the specified torque.
FMVSS 1 : NR FMVSS 2 : NR
Description of the Safety Risk : In this case, the ground cable might not be correctly secured. Subsequently, the electric resistance at the connection might increase. In combination with the high electrical currents potentially flowing through this connection, the temperature in this area might increase. As a consequence, a risk of fire cannot be ruled out completely.
Description of the Cause : Due to a deviation in the vehicle production process, the 48V ground connection in the engine compartment might not be tightened to the specified torque. The issue described is not caused by a supplier.
Identification of Any Warning In the case of intermittent increased resistance at the connection, the driver will not receive a warning due to the nature of the failure mechanism. The information contained in this report was submitted pursuant to 49 CFR §573 Part 573 Safety Recall Report 24V-100 Page 4 that can Occur : In the event of an impairment of the 48V system, warning messages are displayed in the instrument cluster relating to the 48V onboard power supply such as “48 V Battery See Operator’s Manual.” Involved Components : Component Name 1 : electrical wiring harness Component Description : electrical wiring harness Component Part Number : A2135402870 Supplier Identification : Component Manufacturer
Name : MBAG Address : NR
NR
Country : NR Chronology :
In late 2022, MBAG became aware of isolated field reports in the US in which customers allegedly experienced various warning messages. From late 2022 and into March 2023, MBAG investigated those reports, and based on these analyses, hypothesized that an insufficiently tightened ground connection for the 48V-battery-system could have contributed to the reported warning messages. However, the torque data from quality control testing during production indicated that the bolt torque of the ground connection in these vehicles were tightened in accordance with specifications. In April 2023, out of an abundance of caution, MBAG added an additional step to its production process to check and re-tighten the ground connection for the 48V- battery system on all potentially affected production lines. From April until July 2023, MBAG continued to investigate the disparity between the field reports of insufficient bolt torque and MBAG’s production testing data, including laboratory testing and production line audits. Based on its findings, MBAG determined that subsequent assembly steps could in some instances lead to a loosening of the ground connection. At that time, it was not possible for MBAG to identify the population of potentially affected models or model years. The information contained in this report was submitted pursuant to 49 CFR §573 Part 573 Safety Recall Report 24V-100
Page 5
The information contained in this report was submitted pursuant to 49 CFR §573
Therefore, during the second half of 2023 and the beginning of 2024, MBAG analyzed worldwide field reports for conditions that could have resulted from a loose ground connection of the 48V-battery-system, and associated production data. These analyses allowed MBAG to identify potentially affected vehicle models and production dates. On February 2, 2024, MBAG determined that a potential safety risk in the identified vehicle population cannot be ruled out and decided to conduct a recall. MBAG is currently aware of 3 field reports received on September 1, 2022, December 7, 2022, and December 12, 2022. MBAG is aware of no reports of property damage, fatalities, or injury related to this defect.
Description of Remedy :
Description of Remedy Program : An authorized Mercedes-Benz dealer will check the bolt torque of the 48V
ground connection on the affected vehicles and correct it, if necessary. How Remedy Component Differs from Recalled Component :
Identify How/When Recall Condition was Corrected in Production :
Pursuant to 49 C.F.R. § 577.11(e), MBUSA does not plan to provide notice about pre-notice reimbursement to owners since none of the involved vehicles would have been previously subject to the condition described and all remain covered under the new vehicle warranty.
The 48V ground connection in the engine compartment is tightened to the specified torque.
A change in the production procedure ensures that this issue can no longer occur from April 7, 2023 onwards. Recall Schedule :
Description of Recall Schedule : Dealers will be notified of the pending voluntary recall campaign on
February 16, 2024. Owners will be notified of the voluntary recall campaign before April 9, 2024. A copy of all communications will be provided when available.
Planned Dealer Notification Date : FEB 16, 2024 – NR Planned Owner Notification Date : APR 09, 2024 – NR
* NR – Not Reported

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Mercedes-Benz USA, LLC A Mercedes-Benz Group AG Com pany
One Mercedes-Benz Drive Sandy Springs, GA 30328 770.705.0600
News Channel Update | Vehicle Compliance & Analysis
IMPORTANT RECALL CAMPAIGN INFORMATION
Please see the attached documents related to the campaign listed above.
Please note that all customer inquiries should be directed to the Customer Assistance Center at 1-800-FOR-MERCEDES.
Sincerely,
Gregory Gunther
Senior Manager, Vehicle Compliance & Analysis
TO: Mercedes-Benz Dealer Principals, General Managers, Sales Managers, Service Managers, Parts Managers
FROM: Gregory Gunther, Senior Manager, Vehicle Compliance and Analysis, Engineering Services
RE: Recall Campaign Initial Notification
Check 48V Ground Connection
MY21-23 E-Class, CLS, and AMG GT 4-door (213, 257, and 290)
DATE: February 16, 2024
Mercedes-Benz USA, LLC A Mercedes-Benz Group AG Com pany
One Mercedes-Benz Drive Sandy Springs, GA 30328 770.705.0600
News Channel Update | Vehicle Compliance & Analysis
Recall Campaign Initial Notification
February 16, 2024
Campaign No. :
NHTSA ID
Campaign Desc. :
Check 48V Ground Connection
TBA
24V100
24P5491318
This is to notify you of the new Recall Campaign to check the 48V ground connection on 12,176 Model Year (“MY”) 2021-2023 E-Class, CLS, and AMG GT 4-Door (213, 257, and 290 platform) vehicles. The recall campaign will be visible on the www.NHTSA.gov website and may generate questions from customers. Affected VINs will be flagged in VMI as “PENDING” on February 16, 2024.
Background
Issue
Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY 2021-2023 E-Class (213 platform), CLS (257 platform) and AMG GT 4-door (290 platform) vehicles, the 48V ground connection located in the engine compartment might not be tightened to the specified torque. In this case, the ground cable might not be correctly secured. Subsequently, the electric resistance at the connection might increase. In combination with the high electrical currents potentially flowing through this connection, the temperature in this area might increase. As a consequence, a risk of fire cannot be ruled out completely.
What We’re Doing
MBUSA will conduct a voluntary recall. An authorized Mercedes-Benz dealer will check the bolt torque at the 48V ground connection on the affected vehicles and correct it, if necessary.
Parts
Remedy is not available at this time.
Vehicles Affected
Vehicle Model Year(s)
2021-2023
Vehicle Model
E-Class, CLS, and AMG GT 4-door
Vehicle Populations
Total Recall Population
12,176
Total Vehicles in Dealer Inventory
118
Given this notice, it is a violation of Federal law for a dealer to sell or lease any new vehicles in dealer inventory covered by this notification until the vehicle has been repaired. Once the remedy is available, the vehicles will be flagged as “OPEN” and Work Instructions will be available in NetStar VMI and Xentry Portal. Once the repair is complete, the vehicle may be sold or leased.
Loaner and demonstrator vehicles may continue to be driven, but must not be retailed until repaired. As a matter of normal service process, please check for other repair measures which might be applicable to the vehicle(s).
Additionally, given this notice, it is a violation of Federal Law for car rental companies to rent new vehicles covered by this notification until the vehicle has been repaired.
Next Steps/Notes
Customer Notification Timeline
Customer letters will be mailed on or before April 9, 2024.
AOMS/SOMS
AOMs – This recall may generate questions from your dealers. Please forward this notice to your dealers ASAP.
Rental Fleet Partners
This recall may affect vehicles in your fleet. Please contact your respective MBUSA fleet representative for further information and next steps. For repairs, please contact your preferred MBUSA dealer.
Customer Reimbursement
Customer reimbursement is not being offered for this campaign.
While we regret any inconvenience this may cause, MBUSA is determined to maintain a high level of vehicle quality and customer satisfaction. Please refer all customer inquiries to the Customer Assistance Center at 1-800-FOR-MERCEDES.

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Mercedes-Benz USA, LLC A Mercedes-Benz Group AG Com pany
One Mercedes-Benz Drive Sandy Springs, GA 30328 770.705.0600
News Channel Update | Vehicle Compliance & Analysis
IMPORTANT RECALL CAMPAIGN UPDATE
Please see the attached documents related to the campaign listed above.
Please note that all customer inquiries should be directed to the Customer Assistance Center at 1-800-FORMERCEDES.
Sincerely,
Gregory Gunther
Senior Manager, Vehicle Compliance & Analysis
TO: Mercedes-Benz Dealer Principals, General Managers,
Sales Managers, Service Managers, Parts Managers
FROM: Gregory Gunther, Senior Manager, Vehicle
Compliance and Analysis, Engineering Services
RE: Recall Campaign Launch Notification
Check 48V Ground Connection
MY21-23 E-Class, CLS, and AMG GT 4-door (213,
257, and 290)
DATE: March 8, 2024
Mercedes-Benz USA, LLC A Mercedes-Benz Group AG Com pany
One Mercedes-Benz Drive Sandy Springs, GA 30328 770.705.0600
News Channel Update | Vehicle Compliance & Analysis
Recall Campaign Launch Notification March 8, 2024
Campaign No. : NHTSA ID
CA DMV ID Campaign Desc. : Check 48V Ground Connection
2024030001 24V100 23P5491318
This is to notify you of the Recall Campaign Launch to check the 48V ground connection on 12,176 Model Year (“MY”) 2021-2023 E-Class, CLS,
and AMG GT 4-Door (213, 257, and 290 platform) vehicles. The recall campaign will be visible on the www.NHTSA.gov website and may
generate questions from customers. Affected VINs will be flagged in VMI as “OPEN” on March 8, 2024.
Background
Issue
Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has determined that
on certain MY 2021-2023 E-Class (213 platform), CLS (257 platform) and AMG GT 4-door (290
platform) vehicles, the 48V ground connection located in the engine compartment might not be
tightened to the specified torque. In this case, the ground cable might not be correctly secured.
Subsequently, the electric resistance at the connection might increase. In combination with the
high electrical currents potentially flowing through this connection, the temperature in this area
might increase. As a consequence, a risk of fire cannot be ruled out completely.
What We’re Doing MBUSA will conduct a voluntary recall. An authorized Mercedes-Benz dealer will check the bolt
torque at the 48V ground connection on the affected vehicles and correct it, if necessary.
Parts The remedy is available and can be performed.
Vehicles Affected
Vehicle Model Year(s) 2021-2023
Vehicle Model E-Class, CLS, and AMG GT 4-door
Vehicle Populations
Total Recall Population 12,176
Total Vehicles in Dealer Inventory 118
Given this notice, it is a violation of Federal law for a dealer to sell or lease any new vehicles in dealer inventory covered by this
notification until the vehicle has been repaired. Once the remedy is available, the vehicles will be flagged as “OPEN” and Work
Instructions will be available in NetStar VMI and Xentry Portal. Once the repair is complete, the vehicle may be sold or leased. Loaner
and demonstrator vehicles may continue to be driven, but must not be retailed until repaired. As a matter of normal service process,
please check for other repair measures which might be applicable to the vehicle(s). Additionally, given this notice, it is a violation of
Federal Law for car rental companies to rent new vehicles covered by this notification until the vehicle has been repaired.
Notice to California Dealers: As required by 13 CCR 2117, a Proof of Correction (“POC”) certificate showing that the vehicle has been
repaired under this recall must be issued by the authorized Mercedes-Benz dealer, and that such a certificate may be required by
California as a condition of vehicle re-registration or operation. Please reference this POC in the attached work instructions. Failure
to complete this step may result in fines and penalties and lead to customer dissatisfaction.
Next Steps/Notes
Customer Notification Timeline Customer letters will be mailed on March 22, 2024.
AOMS/SOMS AOMs – This recall may generate questions from your dealers. Please forward this notice to
your dealers ASAP.
Rental Fleet Partners This recall may affect vehicles in your fleet. Please contact your respective MBUSA fleet
representative for further information and next steps. For repairs, please contact your
preferred MBUSA dealer.
Customer Reimbursement Customer reimbursement is not being offered for this campaign.
While we regret any inconvenience this may cause, MBUSA is determined to maintain a high level of vehicle quality and customer satisfaction.
Please refer all customer inquiries to the Customer Assistance Center at 1-800-FOR-MERCEDES.
2
Campaign No. 2024030001, March 2024
TO: ALL MERCEDES-BENZ CENTERS
SUBJECT: Model E-Class, CLS, and AMG GT 4-Door (213, 257, and 290 platform)
Model Year 2021-2023
Check 48V Ground Connection
Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain
MY 2021-2023 E-Class (213 platform), CLS (257 platform) and AMG GT 4-door (290 platform)
vehicles, the 48V ground connection located in the engine compartment might not be tightened to
the specified torque. In this case, the ground cable might not be correctly secured. Subsequently,
the electric resistance at the connection might increase. In combination with the high electrical
currents potentially flowing through this connection, the temperature in this area might increase. As
a consequence, a risk of fire cannot be ruled out completely. MBUSA will conduct a voluntary recall.
An authorized Mercedes-Benz dealer will check the bolt torque at the 48V ground connection on
the affected vehicles and correct it, if necessary.
Prior to performing this Campaign:
 VMI must be checked before performing campaigns to verify that the campaign is required on
a specific vehicle. Always check for any other open campaigns, and perform accordingly.
 Please review the entire Campaign bulletin and follow the repair procedure exactly as
described.
Approximately 12,176 vehicles are affected.
Order No. P-RC-2024030001
2
P-RC-2024030001
Check 48V Ground Connection
Vehicle option code B01 corresponds to 48 V technology.
Check/test Procedure
1. Disconnect ground line of 12 V battery.
2. Remove dust filter with air duct segment above 48 V battery.
For basic data, see AP83.00-P-8381C.
3. Perform visual check of ground point of 48 V battery (A, Figure 1) for thermal damage. If no damage is visible,
disconnect the ground point.
Do NOT pull on the ground line. If the line was pulled, the ground connection must always be retightened, even
if there is no damage.
The nut of the ground screw connection can be accessed with an extension and swivel socket. (Figure 2).
Figure 1, Top view with removed air duct segment
–
Figure 2, Accessibility of ground screw connection of 48 V battery (W106/3)
A
3
P-RC-2024030001
4. Check the contact surfaces of the bolts, cable lug, and nut for damage. (Figure 3)
a. Thermal damage found in area of 48 V battery ground point (traces on contact surface of nut/cable lug/bolt):
Carry out Work Procedure.
b. No damage present. Assemble in reverse order: End Measure.
Torque ground line to ground bolt 16 Nm.
Figure 3, examples of thermal damage (e.g. evidence of arcing, scorch marks, welding of the nut/cable lug/bolt),
not OK pictures
Work Procedure
1. Replace 48 V battery ground line and replace M8 nut; install new bolt if necessary; remove 48 V battery if necessary.
See AR60.00-P-0100A “Attach ground point to body”” (please take the bolt part number from this).
Remove/install 48 V battery. For basic data, see AR54.10-P-0022LWO (model 213)
Remove/install 48 V battery. For basic data, see AR54.10-P-0022FR (models 257, 290)
Ensure routing without chafe marks (use Figure 1 for orientation).
Subsequently pulling on the line is strictly prohibited and may result in consequential damage.
__________________________________________________________________________________________________
4
P-RC-2024030001
Primary Parts Information
Qty. Part Name Part Number
As required (1) 48 V battery ground line A 213 540 28 70
As required (1) M8 nut N 000000 008271
As required (1) Ground bolt A 000 991 29 03
Small parts such as screws, lock nuts, sealing rings, cable ties, fluids, sealant, etc. are not listed in the parts list. The
required small parts are taken into account in the budgeting.
__________________________________________________________________________________________________
Note: The following allowable labor operation should be used when submitting a warranty claim for this repair:
Warranty Information
Damage
Code
Operation
Number
Description
Labor Time
(hrs.)
54 913 18
12-2035
Check ground point of 48-volt battery.
Includes: Connect/disconnect 12 V battery, remove/install air duct segment,
disconnect/connect ground point of 48-volt battery incl. check
0.5
12-2036 Replace ground line of 48-volt battery (after check). 0.2
12-2037
Replace ground point of 48-volt battery (after check).
Includes: Remove/install 48-volt battery and replace ground bolt
ZM
Note: Always check Xentry Operation Time (XOT) for the current OP-Code times. Labor times are subject to change
and updates may not be reflected in this document.
5
P-RC-2024030001
The following step applies to California dealers only.
Apply Proof of Correction Label (A 000 584 54 13) to area identified in Figure 1. Fill in the blank areas of the label. The
campaign number for the California Proof of Correction is unique and must be entered as such (24V100), your dealer code,
and the date of the repair, using a black permanent marker.
Note: Clean bonding surface prior to affixing label.
Figure 1
The following step applies to California dealers only.
Provide the owner with the completed and signed Proof of Correction Certificate (A 000 584 42 14) (Figure 2), after you
scan a completed form and attach to the RO. The recall number for the California Proof of Correction is unique and must be
entered as such (24V100).
Figure 2
California Proof of Correction Parts Information
Qty. Part Name Part Number
1 Sheet (CA Dealers Only) A 000 584 42 14
1 Label (CA Dealers Only) A 000 584 54 13
Warranty Information (California dealers please submit under a separate claim)
Damage
Code
Operation
Number
Description
Labor Time
(hrs.)
212CA 00 02-0001 Apply Proof of Correction Label and completed Proof of Correction Certificate 0.1

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